Search found 29 matches

by tresho
27 Nov 2012, 13:09
Forum: Cameras and Electronics
Topic: Camera Triggering
Replies: 42
Views: 96259

Re: Camera Triggering

I would think the simplest light-related trigger would be to pass a hand through a light beam aimed at a photo cell. Drop in illumination of the photo cell can easily be used to fire a shutter-triggering circuit. This is a binary switch (whatever the circuitry is) and under the operator's control.
by tresho
27 Nov 2012, 08:12
Forum: Cameras and Electronics
Topic: Camera Triggering
Replies: 42
Views: 96259

Re: Camera Triggering

I don't see much of a feature added by having the operator's voice triggering the shutter. Either push buttons or photoelectric triggering seem the way to go. Should be fairly easy to set up a light beam apparatus -- after lining up your page, pass your hand through the light beam & circuitry wi...
by tresho
25 Nov 2012, 04:06
Forum: Chat
Topic: BSF-Auto - Robot book scanner reads 250 pages per minute
Replies: 4
Views: 14735

Re: BSF-Auto - Robot book scanner reads 250 pages per minute

How about everyone posting their estimate of the MSRP?
My guess is $15,000 :o
by tresho
25 Nov 2012, 04:03
Forum: Chat
Topic: BSF-Auto - Robot book scanner reads 250 pages per minute
Replies: 4
Views: 14735

Re: BSF-Auto - Robot book scanner reads 250 pages per minute

I get the impression from the cited pages and from the video that the scanner is pretty dynamic, the pages being flipped have almost no time to come to rest, and so whether or not the books are 'well-behaved' may not matter, as long as the content of the page is fully visible as the page is being tu...
by tresho
03 Jun 2012, 16:24
Forum: Cameras and Electronics
Topic: Cameras for the Hackerspace Scanner
Replies: 77
Views: 107752

Re: Cameras for the Hackerspace Scanner

So any test that uses the flash is basically nonsense to us.
I would agree that it would be nonsense to use the on-camera flash when copying documents. An independent light source is necessary.
by tresho
03 Jun 2012, 09:16
Forum: Cameras and Electronics
Topic: Cameras for the Hackerspace Scanner
Replies: 77
Views: 107752

Re: Cameras for the Hackerspace Scanner

:arrow: I'm having trouble comparing the scanning of a book with taking a picture of a moving object. Scanning the pages of books while they are still moving past the camera seems beyond the scope of this group. When I am photographing pages in a bound volume (by flipping them with one hand and hold...
by tresho
03 Jun 2012, 02:52
Forum: "Destructive" Scanning
Topic: Destructive scan: page removal
Replies: 22
Views: 79198

Re: Destructive scan: page removal

I have butchered a few of my books using the simplest method, a utility knife. http://static.www.odcdn.com/pictures/us/od/sk/lg/550467_sk_lg.jpg Blade must be razor sharp. Hack off the hard covers. Use a metal ruler thick enough to serve as a weight on the binding, wide enough so you don't cut your ...
by tresho
03 Jun 2012, 02:36
Forum: Cameras and Electronics
Topic: Cameras for the Hackerspace Scanner
Replies: 77
Views: 107752

Re: Cameras for the Hackerspace Scanner

I've used the SD780IS,handheld, to copy pages from bound materials as fast as I could turn them. No problem with speed of response. How fast can you take individual pages in a book scanner so that a "slow" response could be noticed?
by tresho
20 May 2012, 01:09
Forum: Cameras and Electronics
Topic: Camera Triggering
Replies: 42
Views: 96259

Re: Camera Triggering

I once owned a Kodak microfilm camera / viewer, probably 1940's vintage. It had a microfilm camera on top, along with a light source and microfilm feeding mechanism for projecting roll microfilm onto a white screen at the bottom. Basically a box about 3 feet high , 2 feet wide & deep, open on on...
by tresho
15 May 2012, 17:58
Forum: Cameras and Electronics
Topic: Cable release adapters
Replies: 3
Views: 6902

Re: Cable release adapters

It might even be possible to use epoxy putty to create the clip portion that mates with the hot shoe, as shown in the photo. I have done similar things -- form plastic molds that conform EXACTLY to a plastic camera body, though its tricky not to get epoxy stuck to part of the camera. Plastic food wr...